Sheet-metal pole



J. C. KNOLL.

SHEET METAL POLE.

APPLICATION FILED MAR. 21,

Patented A11 29, 1916.

UNITED STATES PATENT ()FFICE.

JULIUS C. KNOLL, OF ERIE, PENNSYLVANIA.

SHEET-METAL POLE.

Application filed March 21, 1912.

'1 '0 art whom it may concern:

Be it known that I, JULIUS C. KNOLL, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Sheet-Metal Poles; and I do hereby declare the following to he a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings and to the letters of reference marked thereon, forming part of this specification.

l\Iy invention relates to improvements in sheet-metal poles, and has for its object the simplification of their construction, whereby I obtain the maximum of strength therein, at a minimum cost.

I am aware that sheet-metal poles have heretofore been made of various forms of construction, but all of them were so difficult and expensive to manufacture and erect, that few or none of them have come into practical use. In my construction, I overcome these difliculties by rolling sheets of metal, preferably into tapering cylindrical sections, having one of the meeting edges of the sheet, when so formed up, over-lapping the other edge thereof, and placing inside of these sections one or more brace-rings, and upon the outside thereof placing clamprings, said sections being joined together by telescoping one upon another until the required height is obtained.

The features of my invention are hereinafter fully set forth and explained and illustrated in the accompanying drawings in which:

Figure l, is a view in elevation, partly in section, of my improved sheet-metal pole. Fig. 2, is a vertical section of the same, somewhat enlarged. Fig. is an enlarged transverse section of the same on the lines zz=w in Figs. 1 and 2. Fig. l, is an enlarged transverse section of one of the telescopic joints thereof, on the line g y, in Figs. 1 and 2. Fig. 5, shows a vertical section of a modified construction of the central part of one of the sections of my improved pole. Fig. 6, is a vertical section Specification of Letters Patent.

Patented Au 29, 1916.

Serial No. 685,180.

of a modified construction of the upper end of one of the sections of my improved pole.

In these drawings, A and A, represent sections of my improved sheet-metal pole telescoped together as at B. These tube sections are made by rolling plates of the proper widths into tapering tubes so formed up that one edge (6, of the plate over-laps the opposite edge 6/ thereof. In the upper ends of these tube-sections I insert bracerings C, and also like brace-rings C, at one or more points therein to retain the tubesections at the proper diameter, as clearly shown in Fig. 2. I also place on the outsides of the lower ends of these tube-sections clamp-rings D, and preferably like clamp-rings D, at one or more intermediate points thereon. In this manner I construct the tube-sections at a minimum cost, yet very strong and rigid. I telescope together these tube-sections as at B. In this manner I can erect a pole of any height desired, according to the number of sections used therein. In the lower end of the bottom section I place a closed brace-ring E, if desired, and on the upper end of the top section I place a clamp-ring D and can also place an ornamental closure F, therein which will operate as a brace-ring therefor.

In Figs. 5 and 6, I show a modified construction of the. tube-sections of 111W improved sheet-metal pole, in which inwardly projecting beads (E, are rolled during the forming of the tube-sections to support the brace-rings G, and O, and prevent their slipping downward in the tube-sections during the process of joining and erecting the po e.

From the foregoing it is believed that the features and operation of my invention are so obvious that further description thereof 1s unnecessary.

Therefore having described my invention so as to enable others to utilize the same, what I claim new and desire to secure by Letters-Patent is:

The combination in a sheet metal pole formed by rolling up a plate of sheet metal into a tapering tube, with the edges of said plate overlapping, and with portions of said tube of smaller diameter than the re maining portions thereof, external rings In testimony whereof I aflix my signature around said tube at the points of the reduoin presence of tWo Witnesses. tion of diameter of said tube, and non-col- JULIUS C. KNOLL. lapsible members insertible Within said tube -Witnesses:

5 immediately above said points of reduced MYERS,

diameter, substantially as described. H. M. STURGEON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington. D. C. 

